Micromod MOD: MODCELL Multiloop Processor 2002N Model C and Manuale Utente Scaricare il pdf (Pagina 51)

MODCELL Multiloop Processor

ELECTRICAL CONNECTIONS

3.7 2020N REMOTE I/O INTERFACE CONNECTIONS (RIO)

Make remote I/O interface connections as shown in Figure 3-15. One remote I/O interface

module is required for each remote I/O network. Specifications are:

REMOTE I/O INTERFACE RS485 SERIAL NETWORK

Bus Master . . . . . . . . . . . 2020N Remote I/O Interface Module (end of bus)

Bus Slaves . . . . . . . . . . . . Remote I/O Digital Modules

Maximum Length . . . . . . . 500 meters (1600 feet)

Baud rate . . . . . . . . . . . . . 187.5K

Max addresses . . . . . . . . . 32 (31 slaves + 1 RIO master at address 0)

Termination . . . . . . . . . . . 120 ohm resistor is required across the two conductors

at each end of the cable (2 shipped with RIO module)

Shield . . . . . . . . . . . . . . . Required over 50 meters (160 feet)

REMOTE I/O INTERFACE CABLE

Indoor use . . . . . . . . . . . . Beldon #9182

Indoor plenum use . . . . . . Beldon #89182

Underground use . . . . . . . Beldon #9815 twisted twinax

Outdoors above ground use NOT recommended

Wiring . . . . . . . . . . . . . . . Use same cable type throughout network. Avoid

interruptions (wire to same terminals if necessary).

Do not wire through terminal blocks.

Figure 3-1 4. Typical Interface Circuit for 2020N Remote I/O Interface Module (RIO)

MASTER

BUS1

BASE INSTRUMENT

UPPER

TERMINAL

HOUSING

2020N REMOTE I/O

INTERFACE MODULE

(Locations 1 & 2)

BUS2

BUS1

142

DATA

Processor

SEL

CLK

GND

+5V dc

RS485

+5V dc

12 nF

class Y*

BUS2

Shield

3 18

Remote Unit

BUS1

BUS2

Shield

3 18

Remote Unit

120 Ohm

1/4 W

Reserved

* Connect capacitor to grounded cabinet

when noisy elements are in the area.

Otherwise, shield terminal can be used.

Class Y capacitor rated for use between

power line and ground.

** CAUTION

DO NOT connect RS485 bus to these

terminals. RIO module will be

damaged.

Note: RIO module is opto-isolated from

all units

SH1

120

ohm

1/4 W

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 81 82

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Micromod MOD: MODCELL Multiloop Processor 2002N Model C and Manuale Utente Pagina 51

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